Rock-drill



0. E. CLARK.

ROCK DRILL.

APPLICATION FILED JULY l9, l9l8.

1,3 ,40 Patented Aug. 23, 1921.

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llllllllllii Willi" ORNEY 0. E. CLARK.

ROCK DRILL.

APPLICATION FILED JULY I9. I9l8.

Patented Aug. 23, 1921.

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2a T 40 2/ L V 7 f/ V 9 WA ATTORNEY employed for actuating UNITED STATES PATENT OFFICE.

OMAR E. CLARK, OFDENVER, COLORADO, ASSIGNOR' TO DENVER ROCK'DRILL MZAN'UFACT'U'RING COMPANY, OF DENVER, COLORADO, A CORPORATION OF DELAWARE Specification of Letters Patent.

ROCK-DRILL.

Patented Aug. 23, 1921.

Application filed July 19, 1918. Serial No. 245,696.

To all whom it may concern Be it known thatI, OMAR E. CLARK, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification.

The present invention relates to improvements in rock drilling apparatus, and more particularly that type in which one motor is the drill steel to effect the drilling operation, and another motor is utilized foretlecting the necessary rotation of the drill steel. As is well known to those skilled in the art, it is common to provide drilling apparatus that can be either manually held or mounted on a mechanical support, the former being used more particularly in sinking operations, namely, for producing downwardly extending holes, and the latter in drifting. It is also desirable to haveindependent controlling means for the two motors, so that either can be operated independently of the other. lVhen, however, the drilling apparatus is manually held, it is inconvenient to independently operate the valves, since one hand is required to hold and direct the machine. This is, of course, not the case when the machine is mechanically mounted, as both hands of the operator are then free and the two controlling valves can be moved as desired.

One of the primary objects of the present invention is to provide means whereby the independent control can be provided for, so that each valve can be actuated'independently of the other, and also to so construct the mechanism that the two valves can be coupled, in order that the operation of one will eiiect the operation of the other, thus making the apparatus readily convertible from a hand machine to a mechanically supported apparatus. 4

Another and important object is to pro vide novel distributing means for the motive fluid delivered to the drill actuating motor, said means being simple in character and very readilyaccessible.

An embodiment of the invention is illustrated in the accompanying drawings, wherein 1 Figure 1 is a side elevation of a drilling machine,

Fig. 2 is a rear end elevation of the same,

Fig. 3 is a longitudinal sectional view on the line 3-8 of Fig. 2, V

F ig. 4: is a sectional view on the line 1- 1 of Fig. 2,

Fig. 5 is a detail sectional view on the line 55 of Fig. 4,

Fig. 6 is a detail face view of one of the spacing washers,

Fig. 7 is a view in elevation on an enlarged scale of the valves, and coupling member, and

Figs. 8, 9, 10 and 11 are respectively detail cross sectional views on the lines 8-8, 99, 10-1O and 1111 of Fig. 7.

Similar reference numerals designate cor responding parts in all the figures of the drawings.

In the present embodiment, a hammer drill is disclosed, which includes a cylinder .member, comprising a barrel 12 having a front head 13 and a rear head 14, the latter being provided with a handle 15. The front head carries the usual rotatable chuck .16 operated by a rotary motor, shown generally at 17. It is believed to be unnecessary to go into detail regardingthese'parts, as they will be understood by those acquainted with the art.

The rear head 14 is provided with an integral transverse valve casing 18 having, one end tapered to receive a correspondingly tapered throttle valve 19, provided with an exposed actuating head 20. Leading from this casing and controlled by the valve 19 is a supply passageway 21 that delivers motive fluid to the rotary motor 17. An eX- haust passageway 22 from said motor, opens into the valve casing. The valve 19, as illustrated more particularly in Fig. 5, has a supply port 23 movable into and out of communication with the passageway 21, and opening through the end of the valve, as shown in Fig. 4. A channel 24 in the valve affords communication between the exhaust passageway 22 and a passageway 25 leading to the atmosphere.

The end of the valve casing 18, opposite to that containing the valve 19, is provided with a detachable bushing 26 held in place by a screw plug 27, and provided with an internal able between the ports outwardly tapered seat in which is located another throttle valve 28. This valve is also provided with an exposed actuating head 29 arranged on the opposite side of the barrel head 14 to the valve head 20. A passageway 30 for supplying motive fluid to the interior of the barrel leads from the bushing 26, through the head 14, and a port 31 in the valve 28, opening through the inner end of the valve and through one side of the same, is movable into and out of communication with the passageway 30. Motive fluid is supplied to the valve casing between the valves 19 and 28 through a port 32, to which can be coupled a hose line leading from any suitable source of supply.

The barrel 12 is provided with the usual piston. chamber 33 in which reciprocates a hammer piston 34 for operating in a well known manner on a drill steel placed in the chuck 16, and the motive fluid entering the passageway 30 is distributed to effect the operation of the piston 34 by the following mechanism:

The barrel 12 is provided on one side with an enlargement 35 in which is formed a chamber 36 opening through the end of said barrel; A passageway 37, leads from the inner end of the chamber to the piston chamber 33 in advance of the piston 34, and another passageway 38 leads from said chamber 36 to the piston chamber 33 in rear of the piston 34. A cage 39 is located in the inner end ofthe chamber 36, and has a port 40 in communication with the passageway 37. This cage also has a closure plug 41 in its outer end provided with a port 42 that is in communication with the passageway 38. A ball valve 43, located in the cage, is mov- 40 and 41 to alternately close the same. The cage is held in the inner end of the chamber 36 by a washer 44, having spacing ribs 45 that bear upon the plug 41 and serve to afl ord communication between the port 42 and passageway 38. The outer end of this washer has a central boss 46 surrounded by a packing gasket 47, and located upon said packing gasket, is a partition 48, which is borne against by another washer 49 corresponding to the washer 45, and having a packing gasket 50 thereon. A closure plug 51 for the chamber serves to hold all the parts in associated relation. The passageway 30 communicates with the outer end of the chamber 36, above the partition 48, and the inner side of the washer 49 permits the flow of the motive fluid across the chamber into a passageway 52 that communicates with the interior of the cage 39 between the ports 40 and 42, as shown at 53. Suitable exhaust permitting means 54 permit the escape of the motive fluid from the barrel.

With this construction, it will be evident that if the valve 19 is turned to the proper position, motive fluid will flow to the rotary motor 17 and effect its operation. Likewise if the valve 28 is moved to register with the passageway 30, motive fluid will be delivered into the cage 39. With the parts as shown in Fig. 3, exhaust can take place in rear of the piston 34, and consequently the ball valve will be moved to close the port 42 and open the port 40. This motive fluid will'therefore enter the piston chamber 33 in advance of the piston and move the same rearwardly until pressure behind the piston builds up sufliciently to unseat the valve 43 from the end port 42 and cause it to seat over the port 40, whereupon the motive fluid will be admitted behind the piston to drive it forwardly. As already stated, the independent operation of the valves is entirely convenient when the machine is mounted on a cradle or other mechanical support, but if it is desired for hand sinking purposes, the operator must grasp the handle 15 with one hand, thus leaving but one hand free to manipulate the valves. Therefore to overcome the inconvenience of operating the two valves inde pendently, the following coupling is provided. The inner ends of the valves 19 and 28 are provided with recessed angular seats 54 and 55, and a coupling plate 56 is adapt ed to be placed between the valves, with its ends engaged in said seats. This can be readily accomplished when it is considered that the valve 28 can be easily removed by removing the plug 27 and the bushing 26. When the parts are as shown in Fig. 5, it will therefore be evident that if one of the valves is actuated, the other valve will also be moved. Consequently it re uires only the operation of one handle to e ect the simultaneous movements of said valves.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is 7 1. In apparatus of the character set forth, the combination with a drill actuating motor, of a drill rotating motor, an actuatf .ing device, and mechanism for eflectingthe control of one motor independently of the other or both simultaneously by said actuating device. 7

2. In apparatus of the character set forth, the combination with a drill actuating motor, of a drill rotating motor, means for supplying motive fluid to the motors, an actuating device, and means for eifecting either the control of the supply of motive fluid to one of said motors independently of the other or to both simultaneously by said actuating device.

3. In apparatus of the character set forth, the combination with a drill actuating motor, of a drill rotating motor, means for supplying motive fluid to the motors, valves respectively controlling the supply of motive fluid to the motors, an actuating device, and means for causing the actuating device to operate one or both of the valves.

at. In apparatus of the character set forth,

r the combination with a drill actuatin motor, of a drill rotating motor, means for supplying motive fluid to the motors, valves respectively controlling the supply of motive fluid to the motors, an actuating device, and means for coupling and uncoupling the valves to permit their independent or conjoint movements.

5. In apparatus of the character set forth, the combination with a drill actuating m0- tor, of a drill rotating motor, means for supplying motive fluid to the motors, independently operable rotary valves located end to end and respectively controlling the supply of motive fluid to the motors, and means for detachable coupling of the valves to secure the operation of both when one is actuated.

6. In apparatus of the character set forth, the combination with a drill actuating motor, of a drill rotating motor, means for supplying motive fluid to the motors, independently operable rotary valves locater end to end and respectively controlling the supply of motive fluid to the motors, means for detachably mounting one of the valves, and a coupling for connecting the inner ends of the valves, said coupling being removable and replaceable when the said valve is detached from its mounting.

In testimony whereof I aflix my signature in the presence of two Witnesses.

. OMAR E. CLARK.

Witnesses:

LORENZO E. CROFT,

S. WILLIAM JOHNSON. 

